Feature #16: Color in gray (luminance)
Transform the image to keep only a gray version, but with a smarter computation than a simple average of the R, G, B components.
Feature description
Transform the image to keep only a gray version, but with a smarter computation than a simple average of the R, G, B components. The resulting image with a simple average will lake luminosity. Instead, try to use the luminosity formulae with the given values 0.21, 0.72, and 0.07 like in the pseudo-code below:
unsigned char value = 0.21 * getPixel(x, y)->R + 0.72 * getPixel(x, y)->G + 0.07 * getPixel(x, y)->B| Parameters | value |
|---|---|
| name | color_gray_luminance |
| Command | -c color_gray_luminance |
| Input | an image |
| output | a new image image_out.bmp that keeps only a gray version of the input image |
Usage
./freud.exe -f images/input/image.jpeg -c color_gray_luminanceOutput
A new image image_out.bmp as a gray version of the input image
Tips for implementing the feature Use write_image_data from <estia-image.h> to create new image with the new values.
/**
* Writes into an image file
* @param[in] filename Name of the file to be written into
* @param[in] data Reference to the pixel array to be written
* @param[in] width Width of the image
* @param[in] height Height of the image
* @return 0 on failure and non-0 on success.
*/
int write_image_data(const char *filename, unsigned char *data, int width, int height);Additional information
Example:
| Input | Output |
|---|---|
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